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Herbaceous Perennials Fact Sheet No Herbaceous Perennials Fact Sheet No. 7.405 Gardening Series|Flowers by M. Meehan, J.E. Klett and R.A. Cox * An ever-expanding palette of herbaceous Quick Facts perennials lets home gardeners create showy collections. New cultivars and hybrids • These herbaceous perennials become available regularly. are best adapted for Under normal growing conditions, Colorado's lower elevations. herbaceous perennials live many years. They die back to the ground each winter, unlike • Herbaceous perennials differ woody plants such as trees and shrubs. in bloom period, flower color, Perennials quickly establish themselves in a height, foliage texture and few growing seasons and create a backbone environmental requirements. for the flower garden. • Environmental requirements Plants vary in flower color, bloom time, include sun and wind height, foliage texture and environmental requirements. Environmental requirements exposure or lack of it, soil include sun exposure, soil conditions conditions and water needs. and water needs. The key to a successful • Matching the perennial perennial garden is to choose plants whose plant to the site conditions requirements match your site’s conditions. produces a successful Table 1 lists perennials adapted to the perennial garden. broad range of growing conditions in Colorado's lower elevations. Many also do well at higher elevations, but for a more specific listing of perennials adapted to higher elevation, see fact sheet 7.406, Flowers for Mountain Communities. Fact sheet 7.400, Ground Cover Plants includes herbaceous perennial groundcovers not listed below. More information on design and maintenance of perennial gardens can be found in fact sheet 7.402, Perennial Gardening. Key to Table 1: a only most common cultivars are listed. b Not Important. Barely-noticeable flowers that are unimportant. The plant is grown for its foliage only. X: Xeric; plants that are adapted to low water conditions once established. M: Plants that prefer moist soils. C: Flowers that are good for cutting. * Cultivar - a variety of a species that is developed, propagated and maintained under cultivation. Short for “cultivated variety.” ** Biennial - a plant that grows foliage the first year, blooms and sets seed the second year, then dies. *M. Meehan, former Colorado State University graduate ©Colorado State University student; J.E. Klett, Extension landscape horticulture Extension. Reviewed 12/08. specialist and professor, horticulture and landscape architecture; and R.A. Cox, Extension horticulture agent, www.ext.colostate.edu Arapahoe County. 12/08 Table 1: Herbaceous perennials best adapted to lower elevations. SUNNY EXPOSURE Botanical and Flower Bloom Common Name Color Period Height Cultivarsa Comments/Cultural Hints Achillea hybrids White-Red- June-Sept. 1.5-2.5' Moonshine, Paprika, Spreads quickly; good for drying. X, C Yarrow Pastels-Yellow Summer Pastels Achillea filipendula Yellow June-Oct. 2.5-4.5' Coronation Gold, Gold Fern-like leaf texture; spreads to 3'. X, C Fernleaf yarrow Plate Agastache cana Pink July-Sept. 1-3' Sonoran Sunset® Fragrant foliage; blossoms smell like bubble Hyssop, double bubblemint gum; Plant Select®. X Agastache rupestris Orange-Red-Pink July-Sept. 2-3' Sunset® Blossoms smell like root beer; favored by Sunset® hyssop hummingbirds; Plant Select®. X Alcea rosea Red-Pink-White June-Aug. 3-6' Chater's Series, Biennial or perennial; use as background Hollyhock Watchman plant; prone to rust disease. C Armeria maritima Red-Pink-White April-June 6-8" Alba, Splendens, Dense rounded mat foliage, adapts to dry Sea pink Victor Reiter soil, salt tolerant. Artemisia ‘Powis Castle' NIb NIb 2-3' Powis Castle Gray foliage; mounding habit. X Powis Castle sage Artemisia ludoviciana NIb NIb 1.5-3.5' Valerie Finnis Upright growth habit; large silver leaves. X Sagewort, prairie sage Artemisia schmidtiana NIb NIb 8-12" Silver Mound Soft, feathery, silver gray foliage; used for Silver mound sage specimen or contrast. X Asclepias tuberosa Orange June-Aug. 2' Best in well-drained soil. X, C Butterfly weed Aster novae-angliae White-Pink-Purple Sept.-Oct. 3-4' Alma Potschke, Prefers well-drained soil; may require New England aster Purple Dome staking. C Aster novi-belgii White-Pink-Purple Aug.-Sept 2-3' Alert, Prof. Kippenburg, Prefers well-drained soil; may require Dwarf Fall aster Snow Flurry staking. C Aurinia saxatilis Yellow April-May 9-12" Compacta, Sulfureum Gray-green mounding foliage; sheer after (Alyssum saxatile) bloom. Basket-of-gold Baptisia australis Blue May-June 2-4.5' Background plant; interesting seed pods. X, C False indigo Berlandiera lyrata Yellow June-July 10-20 in. Flowers give off the scent of chocolate in the Chocolate flower early morning; very xeric. X Callirhoe involucrata Reddish Purple June-Aug. 6" Trailing stems spread to 3'; blooms are Poppy mallow, winecups cup-shaped. Plant Select®. X Catananche caeruleal Blue-Purple June-Aug. 1-1.5' Dark-eyed blooms; tall clumps of slender Cupid's dart leaves. X, C Centaurea dealbata Pink May-June 1-2' Rosea Spiky flowers; deer resistant. X, C Persian cornflower Centaurea montana Blue-Purple May-June 1-2' Perennial version of the bachelor's button Perennial bachelor's button (cornflower) wildflower. X, C Centranthus ruber Red-Pink-White May-Sept. 1-3' Albus Prefers well-drained soil; gray-green foliage. Jupiter's beard, red valerian X, C Coreopsis auriculata Yellow-Orange June-Sept. 4-8 in. Nana Dense, spreading mound of foliage. X Dwarf coreopsis Coreopsis grandiflora Yellow June-Sept. 1-2.5' Baby Sun, Early Extend bloom by removing spent flowers. Coreopsis Sunrise, Sunray X, C Coreopsis lanceolata Yellow June-Aug. 1.5-2' Slender shiny green leaves. X, C Lance-leaf coreopsis Coreopsis rosea Pink Aug-Sept. 1-2' A clump of thread-leaf foliage. Pink coreopsis Coreopsis verticillata Yellow July-Sept. 1.5-2.5' Moonbeam, Zagreb Fine-textured foliage. X, C Threadleaf coreopsis Dalea purpurea Purple June-Aug. 2-3' Long, thin stems with cylindrical flower heads; Purple prairie clover thread-like leaves. X Delphinium hybrids White-Blue-Pink- June-Aug. 2-4' Conn. Yankee, Dwarf Seeds and plant poisonous; may need Larkspur, Delphinium Purple & Giant Pacific hybrids staking. C Dendranthema x morifolium Pink June-Aug. 2-3' Clara Curtis Pink, daisy-like flowers bloom for long periods Hardy chrysanthemum C Pink Daisy Dianthus plumarius Pink-White May-July 1-1.5' Numerous Dense rounded habit; fragrant blooms. Cottage pink Dianthus gratianopolitanus Pink-White May-June 4-8 in. Firewitch, Spotty, Spreading, grass-like clumps; gray-green Cheddar pinks Tiny Rubies fragrant foliage. Echinacea purpurea Purple-Pink-White July-Sept. 2-3' Alba, Magnus, White Stiff habit; good in naturalized Purple coneflower Swan areas. X, C Echinops ritro Blue July-Sept. 3-4' Taplow Blue Prefers well-drained soil; globe flowers can Globe thistle bloom 6-8 weeks. X, C Erigeron hybrids Pink-Purple June-July 1-3' Azure Fairy, Needs well-drained soil; extend bloom by Fleabane Pink Jewel removing spent flowers. C Eriogonum umbellatum Yellow May-July 0.5-1' Kannah Creek Dark green foliage below sulfur yellow button Sulfur flower -like blooms; Plant Select®. X Eryngium planum Blue June-Aug. 1-2' Blaukappe Silver-blue flower heads are good for drying Sea holly X, C Eschscholzia californica Yellow-Orange June-Sept. 1-2' Reseeding annual/tender perennial. X, C California poppy Table 1: Herbaceous perennials best adapted to lower elevations. (Continued) SUNNY EXPOSURE Botanical and Flower Bloom Common Name Color Period Height Cultivarsa Comments/Cultural Hints Euphorbia polychroma Yellow-Chartreuse April-May 1.5-2' Neat green mounds; red fall color; sap may Cushion spurge be a skin irritant; less invasive. Gaillardia x grandiflora Yellow-Red- June-Sept. .5-2.5' Baby Cole, Burgundy, Showy, daisy-like blooms. X, C Blanket flower Orange Dazzler, Goblin Gazania krebsiana Orange May-Sept. 3-8 in. Tanager® Rosette of lobed leaves; short-lived perennial Hardy orange gazania or reseeding annual; Plant Select®. X Gazania linearis Yellow May-Sept. 2-8 in. Colorado Gold® A mop of linear leaves; blooms open in sun; Hardy gazania Plant Select®. X Gypsophila paniculata White- Pink June-Sept. 2-3' Bristol Fairy, Airy plant; delicate blooms; good for Baby's breath Pink Fairy drying. X, C Helenium autumnale Yellow-Red Aug.-Sept. 2-4' Buterpat, Brightly colored, daisy-like blooms. M, C Sneezeweed Moerheim Beauty Helianthemum nummularium Orange-Pink June-July 0.5-1' Apricot, Wisely Pink, Low growing; spreading mounds of foliage; Sun rose Yellow-Red-White Wisely Primrose rock garden plant. X Helianthus maximiliani Yellow July-Aug. 6-10' Strong, branched stems, lance-shaped foliage Maximilian sunflower may flop over if overhead irrigated. X, C Heliopsis helianthoides Yellow July-Sept. 3-4' Summer Sun Use as specimen planting or at back False sunflower of garden. C Iberis sempervirens White April-June 1-1.5' Alexander's White, Glossy green foliage; shear after Candytuft Autumn Snow bloom; may repeat bloom in fall. Iris hybrids Blue-White-Red- May-June 1-2.5' Numerous Prefers well-drained soil; sword-like Bearded iris Purple-Yellow foliage. X, C Knautia macedonica Red May-Sept. 1.5-3' Burgundy pincushion-like flowers; open Knautia macedonica growing habit. X, C Kniphofia uvaria Red-Orange- June-Aug. 2-3' Primrose Beauty, Spikes of flowers arise from clumps of Torch lily, red hot poker Yellow Springtime grasslike foliage. X, C Lathyrus latifolius White-Pink-Red June-Sept. 4-12' Vigorously climbing Perennial sweet pea Purple vine with mixed colored blooms. X Lavandula angustifolia Blue July-Oct. 1-1.5' Hidcote, Munstead Aromatic blooms; semievergreen Lavender foliage. X, C Liatris spicata White-Pink- July-Sept. 2-3' Floristan Violet, Clumps of grassy foliage; dense bottle Gayfeather, blazing star Purple Kobold brush blooms. C Limonium latifolium Purple June-Sept. 1.5-3' Blooms create an airy texture. X, C Sea lavender Linum perenne Blue-White May-June 2' Sapphire Light, airy plant; good wildflower; Blue flax reseeds readily.
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